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Work Plan—PEA Page 7 Former Haley Flying Service GPE Project 474.2 2.0 DATA COLLECTION The following sub-sections describe the rationale and methods that will be used to obtain the samples and laboratory analytical information to be used in the completion of the PEA. 2.1 Field Work Soil and groundwater samples will be collected at specific points on the subject site. These samples fall into three major categories: • Shallow Soil Screening Samples • Shallow Soil Targeted Samples • Groundwater Samples 2.1.1 Sampling Strategy Shallow Soil Screening Samples Most of the site is undeveloped except for the runway. This undeveloped area encompasses about 8 of the 10 acres that comprise the site. There is no particular reason to suspect the area is at elevated risk to have been impacted by hazardous release(s), however, shallow, screening-level samples will be collected at a density of one sample point per acre. These samples will serve as a screening tool to help verify that the undeveloped area has not been impacted, and also to provide suitable background soil samples to compare with targeted samples to be collected in the two developed acres at the east end of the parcel. In the event that laboratory results indicate chemicals have impacted the area, a second round of sampling may be needed to obtain adequate background data. A suite of 8 sample points will be located at grid points selected in the undeveloped area as shown on the overall site sketch map (Figure 2). The grid points were selected authoritatively so that samples can be obtained from the full length and breadth of the part of the parcel occupied by the runway. The shallow soil sample designations will be assigned the prefix "S" followed by a sequence number beginning with 1 and increasing from west to east. Two soil samples will be collected from each sample point, and these will be represent by letter suffixes increasing with depth. Thus, the designation "S-3B" will indicate the second shallowest sample collected from shallow sample point 3. The maps (Figures 2 and 3) also show the proposed sample points and their designations. The samples will be collected on approximately 200-foot spacing intervals, which correspond to one sample per acre. Shallow Soil Targeted Samples A suite of targeted shallow samples will be collected at specific points around the former flight facilities to determine if hazardous substances are present. The specific installations to be targeted are the area near the hangars, the aircraft loading / unloading area, and the washout pit. The sample points are selected at those points deemed most likely to have been impacted 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 Modesto, Ca 95356 Fax: (209) 569-0295